普利明?馬劍達?林建子?戴冽?凌莉



【摘要】目的 以基于ESR的28個關節疾病活動度評分(DAS28ESR)為標準,建立基于CRP的28個關節疾病活動度評分(DAS28CRP)到DAS28ESR的換算方程,并推導DAS28CRP的閾值。方法 選擇于中山大學孫逸仙紀念醫院風濕免疫科就診且同時測量DAS28ESR和DAS28CRP的患者。患者被隨機分至訓練集(70%)和驗證集(30%)中。采用加權Robust回歸建立DAS28CRP到DAS28ESR的換算方程,利用Wilcoxon 符號秩檢驗比較轉換值和實際值差異,采用kappa值評估疾病活動度分類一致性。結果 共納入955例患者。換算方程為DAS28ESR1 = 1.06×DAS28CRP + 0.4275。根據換算方程,DAS28CRP相應的閾值為2.05、2.61和4.40。經過換算后,DAS28ESR轉換值與實際值比較差異無統計學意義(P > 0.05),且kappa值由0.54提升至0.78。結論 成功建立從DAS28CRP到DAS28ESR的換算方程,這有助于不同研究間的比較,所推導出的DAS28CRP閾值有助于提高其與DAS28ESR在疾病活動度評估方面的一致性。
【關鍵詞】類風濕關節炎;疾病活動度;換算方程;閾值;紅細胞沉降率;C-反應蛋白
Establishment of conversion equation from DAS28CRP to DAS28ESR and derivation of threshold of DAS28CRP Pu Liming△, Ma Jianda, Lin Jianzi, Dai Lie, Ling Li. △Department of Medical Statistics, School of Public Health, Sun Yat-sen University, Guangzhou 510080, China
Corresponding author, Dai Lie, E-mail: dailie@mail.sysu.edu.cn; Ling Li, E-mail: lingli@mail.sysu.edu.cn
【Abstract】Objective To establish the conversion equation from DAS28CRP to DAS28ESR and derive the corresponding thresholds of DAS28CRP using DAS28ESR as the standard. Methods Patients who received simultaneous measurement of DAS28ESR and DAS28CRP at Department of Rheumatology of Sun Yat-sen Memorial Hospital were recruited and randomly assigned into the training set (70%) and validation set (30%). The Bisquare-weighted robust regression was applied to establish the conversion equation from DAS28CRP to DAS28ESR. The Wilcoxon signed-rank test was used to compare the difference between the converted values and actual values of DAS28ESR and the kappa values were used to assess the agreement in disease activity classification. Results A total of 955 patients were enrolled in the study. The conversion equation was: DAS28ESR1 = 1.06 × DAS28CRP + 0.4275. According to the conversion equation, the corresponding thresholds for DAS28CRP were 2.05, 2.61 and 4.40, respectively. After conversion, there was no statistical difference between the converted values and actual values of DAS28ESR (P > 0.05). The kappa values were increased from 0.54 to 0.78. Conclusions The conversion equation from DAS28CRP to DAS28ESR is successfully established, which facilitates the comparison of findings among different studies. The derived DAS28CRP thresholds contribute to improving the agreement with DAS28ESR in assessing the disease activity.
【Key words】Rheumatoid arthritis; Disease activity; Conversion equation; Threshold;ESR;CRP
類風濕關節炎(RA)是一種常見的全身性自身免疫疾病,控制疾病活動度,實現緩解是RA的治療目標[1]。美國風濕病學會(ACR)、歐洲風濕病聯盟(EULAR)以及我國《2018中國類風濕關節炎診療指南》均建議定期評估RA患者的疾病活動度,根據評估結果調整治療方案[2-4]。28個關節疾病活動度評分(DAS28)是臨床廣泛應用的疾病活動度評估指標。1995年Prevoo等首先提出使用基于ESR的DAS28(DAS28ESR)評估疾病活動度,并根據特定閾值將患者分為緩解、低疾病活動度、中疾病活動度和高疾病活動度。但是考慮到ESR容易受年齡、性別等影響,Fransen等(2004年)和Tamhane等(2013年)建議使用CRP代替ESR進行評估,即DAS28CRP,并建議使用DAS28ESR閾值,但是未進行驗證。此外……